Evo 8 spark plugs do not fit a 9

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Jul 30, 2006 | 10:44 PM

#16

housedj

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From: in front of your car

Quote:

Originally Posted by SuperHatch

Where is the documented source you heard this from? I.E. - Mitsubishi Engineering Documents. Because until you do, this is completely conjecture, and very poor at that.

The only benefit I see of a taller surface between the top of the combustion chamber and the base of the spark plug valley is more room for cooling passages, which makes much more sense than an effort to eliminate "lifter tick".

well its in the '06 brochure that the head is taller. now they don't actually say that the head is taller to elimiante lifter tick but common sense would tell us that since the MIVEC required a taller head & longer spark plugs that would essentially rid cammed EVOs from that problem...

Jul 31, 2006 | 02:20 PM

#17

Evo_Jay

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From: Chico, CA (NOR-CAL)

Quote:

Originally Posted by housedj

What page?? I have the brochure and never seen that.

Jul 31, 2006 | 02:31 PM

#18

PVD04

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From: Wisconsin

Quote:

Originally Posted by housedj

I'm not sure what type of "common sense" would lead you to the conclusion that a taller head would eliminate lifter tick. Even if the head were six inches taller, if the lifters and rocker arms have the same geometry the lifter tick would likely remain present.

-Paul

Dec 5, 2006 | 11:46 AM

#19

Inprogress

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From: Houston, TX

Any update if there is a 1 step colder plug available for the EVO IX?

Dec 5, 2006 | 09:23 PM

#20

Wheelhaus

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From: Denver

Quote:

Originally Posted by Inprogress

Any update if there is a 1 step colder plug available for the EVO IX?

or if there are any other plugs that fit the IX in the same heat range?

Dec 9, 2006 | 08:03 AM

#21

EVOIX2NV

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HKS Part number: S40iL
OE NGK number: ILFR7H

Stock Plug= NGK ILFR7H Stock #5245 LINK
Step colder= NGK R7437-8 Stock #4901 LINK
2 Steps colder= NGK R7437-9 Stock #4654 LINK
3 Steps colder= NGK R7437-10 Stock #4655 LINK

NGK ILFR7H (OEM) Iridium
http://www.sparkplugs.com/more_info.asp?AAIA=&pid=20451

NGK LFR7AIX Iridium
http://www.sparkplugs.com/more_info.asp?AAIA=&pid=16602

Feb 8, 2007 | 10:18 AM

#22

mdsevo06

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From: San Diego

According to NGK Techs, the two plugs are the same except for two minor differences.
ILFR7H - OEM GAPPED AT .024" PLATINUM TIPPED ELECTRODE
LFR7AIX - SAME DIMENSIONS, GAPPED AT .028" (WILL NEED TO BE ADJUSTED) AND ELECTRODE IS NOT PLATIMUM TIPPED.
Difference is the OEM will last longer and will not need to have the gap adjusted. For a difference of $4 a plug, you can adjust the gap and change it at 20K, instead of 30K.